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BL2556 Datasheet(PDF) 4 Page - SHANGHAI BELLING CO., LTD. |
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BL2556 Datasheet(HTML) 4 Page - SHANGHAI BELLING CO., LTD. |
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4 / 4 page  www.belling.com.cn 4 BL2556 DETAILED DESCRIPTION Operation The BL2556 is a current limited switch that protects systems and loads which can be damaged or disrupted by the application of high currents. The core of each device is a 0.25Ω P-channel MOSFET and a controller capable of functioning over a wide input operating range up to 10V. The chip protects against system malfunctions through current limiting, undervoltage lockout and thermal shutdown. The current limit is set around 1.5A and it offers an unique function to limit output voltage at 5V. On/Off control The CE pin controls the state of the switch. When CE is high, the switch is in the ON state. Activating CE continuously holds the switch in the on state so long as there is no fault. An under voltage on VIN or a junction temperature in excess of 165°C overrides the CE control to turn off the switch. Output Over-Voltage Limiting BL2556 provides an unique output voltage limiting function, to protect the load which follows it. When BL2556 find out input voltage higher than 5.3V, it will limit the output voltage, so the output will not exceed standard USB voltage even when input comes across a voltage surge. Current limiting The current limit is internally set around 1.5A to ensure a 1A application. Thermal and Short Circuit Protection BL2556 will shut off its output when its temperature higher than 165°C (typical value). And it has unique short circuit fold-back function to keep itself cold when output is shorted to GND. PACKAGE OUTLINE Package SOT23-5 Devices per reel 3000 Unit mm Package specification: |
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Similar Description - BL2556 |
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